Spring Boot亚马逊AWS S3存储桶文件下载 - 访问被拒绝

Question

我有一个自动配置的AWS，Spring Boot应用程序，我正在尝试设置一个端点，只需从Amazon S3中的给定存储桶下载特定文件。我使用AWS控制台从计算机上将JPEG文件上传到存储桶中 - 现在我正在尝试使用Spring Boot API下载该文件。

我收到以下错误：com.amazonaws.services.s3.model.AmazonS3Exception: Access Denied (Service: Amazon S3; Status Code: 403; Error Code: AccessDenied;

我在AWS控制台上创建了一个用户和一个组（用户在该组中）;用户/组具有S3的完全访问权限以及管理员访问权限。我下载了访问密钥/密钥对，出于测试目的，将密钥直接粘贴到我的application.properties文件中，如下所示（此处未显示密钥，显然:)）。

我很困惑为什么我仍然被拒绝访问。我一直在寻找和研究这个问题;我似乎无法找到特定于Spring Boot的此问题的解决方案。任何帮助将不胜感激。

application.properties：

cloud.aws.credentials.accessKey=myaccesskey
cloud.aws.credentials.secretKey=mysecretkey
cloud.aws.credentials.instanceProfile=false
cloud.aws.stack.auto=false

cloud.aws.region.auto=true
cloud.aws.region.static=myregion

SimpleResourceLoadingBean.java：

@RestController
public class SimpleResourceLoadingBean {

    private static Logger log = LoggerFactory.getLogger(HealthMonitorApplication.class);

    @Autowired
    private ResourceLoader resourceLoader;


    @RequestMapping("/getresource")
    public String resourceLoadingMethod() throws IOException {
        log.info("IN RESOURCE LOADER");

        Resource resource = this.resourceLoader.getResource("s3://s3.amazonaws.com/mybucket/myfile.ext");

        InputStream inputStream = resource.getInputStream();

        return inputStream.toString();
    }
}

pom.xml（只是与问题相关的依赖项）

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-aws</artifactId>
            <version>1.1.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-aws-autoconfigure</artifactId>
            <version>1.1.0.RELEASE</version>
        </dependency>

Answer 1

找出解决方案。除了application.properties配置之外，我还必须创建一个配置类，以便在提供适当的凭据时允许我访问AmazonS3Client对象。我在GitHub上关注这个例子：

https://github.com/brant-hwang/spring-cloud-aws-example/blob/master/src/main/java/com/axisj/spring/cloud/aws/AWSConfiguration.java

AWSConfiguration.java：

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3Client;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AWSConfiguration {

    @Value("${cloud.aws.credentials.accessKey}")
    private String accessKey;

    @Value("${cloud.aws.credentials.secretKey}")
    private String secretKey;

    @Value("${cloud.aws.region}")
    private String region;

    @Bean
    public BasicAWSCredentials basicAWSCredentials() {
        return new BasicAWSCredentials(accessKey, secretKey);
    }

    @Bean
    public AmazonS3Client amazonS3Client(AWSCredentials awsCredentials) {
        AmazonS3Client amazonS3Client = new AmazonS3Client(awsCredentials);
        amazonS3Client.setRegion(Region.getRegion(Regions.fromName(region)));
        return amazonS3Client;
    }
}

配置完成后，您可以在其他类中创建AmazonS3Client对象（自动装配），并使用客户端向S3云发出请求。该示例使用包装类作为服务，以便于实现其他控制器类。

S3Wrapper.java：

import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.*;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

@Service
public class S3Wrapper {

    @Autowired
    private AmazonS3Client amazonS3Client;

    @Value("${cloud.aws.s3.bucket}")
    private String bucket;

    private PutObjectResult upload(String filePath, String uploadKey) throws FileNotFoundException {
        return upload(new FileInputStream(filePath), uploadKey);
    }

    private PutObjectResult upload(InputStream inputStream, String uploadKey) {
        PutObjectRequest putObjectRequest = new PutObjectRequest(bucket, uploadKey, inputStream, new ObjectMetadata());

        putObjectRequest.setCannedAcl(CannedAccessControlList.PublicRead);

        PutObjectResult putObjectResult = amazonS3Client.putObject(putObjectRequest);

        IOUtils.closeQuietly(inputStream);

        return putObjectResult;
    }

    public List<PutObjectResult> upload(MultipartFile[] multipartFiles) {
        List<PutObjectResult> putObjectResults = new ArrayList<>();

        Arrays.stream(multipartFiles)
                .filter(multipartFile -> !StringUtils.isEmpty(multipartFile.getOriginalFilename()))
                .forEach(multipartFile -> {
                    try {
                        putObjectResults.add(upload(multipartFile.getInputStream(), multipartFile.getOriginalFilename()));
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                });

        return putObjectResults;
    }

    public ResponseEntity<byte[]> download(String key) throws IOException {
        GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, key);

        S3Object s3Object = amazonS3Client.getObject(getObjectRequest);

        S3ObjectInputStream objectInputStream = s3Object.getObjectContent();

        byte[] bytes = IOUtils.toByteArray(objectInputStream);

        String fileName = URLEncoder.encode(key, "UTF-8").replaceAll("\\+", "%20");

        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        httpHeaders.setContentLength(bytes.length);
        httpHeaders.setContentDispositionFormData("attachment", fileName);

        return new ResponseEntity<>(bytes, httpHeaders, HttpStatus.OK);
    }

    public List<S3ObjectSummary> list() {
        ObjectListing objectListing = amazonS3Client.listObjects(new ListObjectsRequest().withBucketName(bucket));

        List<S3ObjectSummary> s3ObjectSummaries = objectListing.getObjectSummaries();

        return s3ObjectSummaries;
    }
}

注意：为了使用Apache Commons IO库，需要将以下依赖项添加到pom.xml中。

的pom.xml：

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-io</artifactId>
    <version>1.3.2</version>
</dependency>

Answer 2

接受的答案是使用已弃用的API。这是一个更新版本。

首先，更新您的maven依赖项：

 <dependency>
        <groupId>com.amazonaws</groupId>
        <artifactId>aws-java-sdk</artifactId>
        <version>1.11.274</version>
    </dependency>

AWSConfiguration.java

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AWSConfiguration {

    @Value("${cloud.aws.credentials.accessKey}")
    private String accessKey;

    @Value("${cloud.aws.credentials.secretKey}")
    private String secretKey;

    @Value("${cloud.aws.region}")
    private String region;

    @Bean
    public BasicAWSCredentials basicAWSCredentials() {
        return new BasicAWSCredentials(accessKey, secretKey);
    }

    @Bean
    public AmazonS3 amazonS3Client(AWSCredentials awsCredentials) {
        AmazonS3ClientBuilder builder = AmazonS3ClientBuilder.standard();
        builder.withCredentials(new AWSStaticCredentialsProvider(awsCredentials));
        builder.setRegion(region);
        AmazonS3 amazonS3 = builder.build();
        return amazonS3;
    }
}

S3Service.java

import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.*;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

@Service
public class S3Service {

    @Autowired
    private AmazonS3 amazonS3;

    @Value("${cloud.aws.s3.bucket}")
    private String bucket;

    private PutObjectResult upload(String filePath, String uploadKey) throws FileNotFoundException {
        return upload(new FileInputStream(filePath), uploadKey);
    }

    private PutObjectResult upload(InputStream inputStream, String uploadKey) {
        PutObjectRequest putObjectRequest = new PutObjectRequest(bucket, uploadKey, inputStream, new ObjectMetadata());

        putObjectRequest.setCannedAcl(CannedAccessControlList.PublicRead);

        PutObjectResult putObjectResult = amazonS3.putObject(putObjectRequest);

        IOUtils.closeQuietly(inputStream);

        return putObjectResult;
    }

    public List<PutObjectResult> upload(MultipartFile[] multipartFiles) {
        List<PutObjectResult> putObjectResults = new ArrayList<>();

        Arrays.stream(multipartFiles)
                .filter(multipartFile -> !StringUtils.isEmpty(multipartFile.getOriginalFilename()))
                .forEach(multipartFile -> {
                    try {
                        putObjectResults.add(upload(multipartFile.getInputStream(), multipartFile.getOriginalFilename()));
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                });

        return putObjectResults;
    }

    public ResponseEntity<byte[]> download(String key) throws IOException {
        GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, key);

        S3Object s3Object = amazonS3.getObject(getObjectRequest);

        S3ObjectInputStream objectInputStream = s3Object.getObjectContent();

        byte[] bytes = IOUtils.toByteArray(objectInputStream);

        String fileName = URLEncoder.encode(key, "UTF-8").replaceAll("\\+", "%20");

        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        httpHeaders.setContentLength(bytes.length);
        httpHeaders.setContentDispositionFormData("attachment", fileName);

        return new ResponseEntity<>(bytes, httpHeaders, HttpStatus.OK);
    }

    public List<S3ObjectSummary> list() {
        ObjectListing objectListing = amazonS3.listObjects(new ListObjectsRequest().withBucketName(bucket));

        List<S3ObjectSummary> s3ObjectSummaries = objectListing.getObjectSummaries();

        return s3ObjectSummaries;
    }
}

Answer 3

请更正网址格式

Resource resource = this.resourceLoader.getResource("s3://s3.amazonaws.com/mybucket/myfile.ext");

到

Resource resource = this.resourceLoader.getResource("s3://mybucket/myfile.ext");

根据文档，模式为s3://<bucket>/<object>。它在spring boot 2.0.6.RELEASE和spring cloud Finchley.SR2（已验证）中工作。

参考：Spring Cloud AWS - Downloading files